<template>
    <div>
            <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    
    <el-card>
          <el-alert title="注意： 只允许设置第三级分类设置相关参数！" type="warning"  :closable="false" show-icon></el-alert>
    <!-- 选择商品分类区域 -->
    <el-row class="cat_opt">
        <el-col>
            <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader expand-trigger="hover" :options="catelist"  :props="cateProps" v-model="selectedCateKeys" @change="handleChange">
                </el-cascader>
        </el-col>
    </el-row>

<!-- tab 标签页区域 -->
    <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
            <!-- 添加参数的按钮 -->
            <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加参数</el-button>
            <!-- 动态参数表格 -->
            <el-table :data="manyTableData" border stripe>
                <!-- 展开行 ----->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                        <!-- 循环渲染Tag标签 --->
                        <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                        </el-input>
                        <!-- 添加的按钮 -->
                        <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-tab-pane>

        <!-- 添加静态属性的面板-->
        <el-tab-pane label="静态属性" name="only">
        <!-- 添加参属性的按钮 -->
        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
        <!-- 添加静态属性表格 -->
            <el-table :data="onlyTableData" border stripe>
                <!-- 展开行  ???-->
                <el-table-column type="expand">
                    <template slot-scope="scope">
                        <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                        <!-- 循环渲染Tag标签 --->
                        <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                        </el-input>
                        <!-- 添加的按钮 -->
                        <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                    </template>
                </el-table-column>
                <!-- 索引列 -->
                <el-table-column type="index"></el-table-column>
                <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                <el-table-column label="操作">
                    <template slot-scope="scope">
                        <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                        <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                    </template>
                </el-table-column>
            </el-table>
        </el-tab-pane>
        
    </el-tabs>
    </el-card>

    <!-- 添加参数的3对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
        <!-- 添加参数的对话框 -->
    <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
    </el-form>

  <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
  </span>
</el-dialog>

<!-- 修改参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
        <!-- 添加参数的对话框 -->
    <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
    </el-form>

  <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
  </span>
</el-dialog>

    </div>
</template>

<script>
export default {
    data() {
        return {
            // 商品分类列表
            catelist: [],
            // 级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框双向绑定到的数组
            selectedCateKeys: [],
            // 被激活的页签的名称
            activeName: 'many',
            // 动态参数的数据
            manyTableData: [],
            // 静态属性的的数据
            onlyTableData: [],
            // 控制添加对话框的喜爱是与隐藏
            addDialogVisible: false,
            // 添加参数的表单数据对象
            addForm: {
                attr_name: ''
            },
            // 添加表单的规则验证对象
            addFormRules: {
                attr_name: [{required: true, message:'请输入参数名称', trigger: 'blur'}]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible: false,
            // 修改的表单数据对象
            editForm: {},
            editFormRules:{
                // 修改表单的验证规则对象
                attr_name: [{required: true, message:'请输入参数名称', trigger: 'blur'}]
            },
            // 控制按钮文本框的切换显示
            inputVisible: false,
            // 文本框中高输入的内容
            inputValue: ''
        }
    },
    created() { 
        this.getCateList()
    },
    methods: {
        // 获取所有商品列表
       async getCateList() {
          const {data: res} = await this.$http.get('categories')
          if(res.meta.status !== 200) {
              return this.$message.error('获取商品分类失败')
          }
            this.catelist = res.data;
            // console.log(this.catelist)
        },
        // 级联选择框中选中，会触发的事
        handleChange() {
            this.getParamsData()
        },
        // tab页签点击事件的处理函数
        handleTabClick() {
            this.getParamsData()
            console.log(this.activeName)
        },
        // 获取参数的列表数据
        async getParamsData() {
            // console.log(this.selectedCateKeys)
            // 证明选中的不是三级分类
            if (this.selectedCateKeys.length !== 3) {
                this.selectedCateKeys = []
                this.manyTableData = []
                this.onlyTableData = []
                return
            }
            // 证明选中的是三级分类
            // console.log(this.selectedCateKeys)
            // 根据所选分类的ID， 和当前所处的面板，获取对应的参数 
           const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {params: {sel: this.activeName}})
           if (res.meta.status !== 200) {
               return this.$message.error('获取参数列表失败')
           }
           
           res.data.forEach(item => {
              item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
            //   控制文本框的显示与隐藏 
            item.inputVisible = false;
            // 文本框中输入的值
            item.inputValue = ''
           })
           console.log(res.data)

           if (this.activeName === 'many') {
               this.manyTableData = res.data;
           } else {
               this.onlyTableData = res.data
           }
        },
        addDialogClosed() {
            // 监听对话框的关闭事件
            this.$refs.addFormRef.resetFields()
        },
        // 点击按钮添加参数
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) return
                const {data: res} = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if(res.meta.status !== 201) {
                    return this.$message.error('添加参数失败')
                }
                this.$message.success('添加参数成功')
                this.addDialogVisible = false;
                this.getParamsData()
            })
        },
        // 点击按钮展示修改的对话框
        async showEditDialog(attr_id) {
            const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
                params: {attr_sel: this.activeName }
            })
            if (res.meta.status !== 200) {
                return this.$message.error('获取参数信息失败')
            }
            this.editForm = res.data
            this.editDialogVisible = true
        },
        // 重置修改的表单
        editDialogClosed() {
            this.$refs.editFormRef.resetFields()
        },
                // 点击按钮修改参数信息
        editParams() {
             this.$refs.editFormRef.validate(async valid => {
                if (!valid) return 
               const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                })
                if (res.meta.status !== 200) {
                    return this.$message.error('修改参数失败')
                }
                this.$message.success('修改参数成功')
                this.getParamsData()
                this.editDialogVisible = false
            })
        },
        // 根据id删除对应的参数项
        async removeParams(attr_id) {
          const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).catch(err => err)
        // 用户取消了删除的操作
            if (confirmResult !== 'confirm') {
                return this.$message.info('已取消删除')
            }
            // 删除的业务逻辑
           const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
           if (res.meta.status !== 200) {
               return this.$message.error('删除参数失败')
           }
           this.$message.success('删除参数成功')
           this.getParamsData()
        },
        // 文本框失去焦点或者按下了enter键都会触发 
        async handleInputConfirm(row) {
            if (row.inputValue.trim().length === 0) {
                row.inputValue = ''
                row.inputVisible = false
                return
            } 
            // 如果没有return 则证明输入的内容，需要做后续处理
            row.attr_vals.push(row.inputValue.trim())
            row.inputValue = ''
            row.inputVisible = false
            // 需要发起请求， 保存这次操作 
            this.saveAttrVals(row)
        },
        // 将对attr_vals 的操作 保存到数据库  
        async saveAttrVals(row) {
             const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            })
            if (res.meta.status !== 200) {
                return this.$message.error('修改参数项失败')
            }
            this.$message.success('修改参数项成功')
        },
        // 点击按钮展示文本输入框  
        showInput(row) {
            row.inputVisible = true
            // 让文本输入框自动获得焦点
            // $nextTick方法的作用--当页面上元素被重新渲染之后，才会指定回调函数中的代码
            this.inputVisible = true;
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 删除对应的参数可选项
        handleClose(i, row) {
            row.attr_vals.splice(i, 1)
            this.saveAttrVals(row)
        }
    },
    computed: {
        // 如果按钮需要被禁用，则返回true， 否则返回false
        isBtnDisabled() {
            if(this.selectedCateKeys.length !== 3) {
                return true
            }
            return false
        },
        // 当前选中的三级分类的id
        cateId() {
            if (this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText() {
            if (this.activeName === 'many') {
                return '动态参数'
            }
            return '静态属性'
        },
    }
}
</script>

<style lang="less" scoped>
    .cat_opt {
        margin: 15px 0px;
    }
    .el-tag {
        margin: 10px;
    }
    .input-new-tag {
        width: 120px;
    }
</style>
